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Molds- Turned Turned molds were fabricated using a Haas SL-20 CNC lathe. The tool that was used to create each part had a tool-nose-radius of 0.8mm. The feed of the tool was varied during the facing operation and the speed was held constant at 2000 surface feet per minute. Table 2 has the feeds used for the sets of turned molds. Mold Set Feed [in/rev] T1 T2 T3 0.006 0.012 0.024 Table 2 Feeds for turned mold sets. Molds- Ground The first step as mentioned previously for creation of the ground molds were to be cut to proper length on the Hass SL-20 CNC lathe. A low feed rate was used to create a flat surface that would have low peak to valley roughness to ensure that during the grinding process material removal happened fast and no residual turned marks were left in the ground surface. The purpose behind the short grinding time is so that the surface of die remains flat. When grinding with a rotary polisher the longer the time spent grinding, and the more material removed, the higher the probability of creating a multifaceted surface. Instead of being a single flat surface, the surface would have multiple individually flat surfaces and will result in a poor Nafion modification. The polished surfaces were made using four different grit and two type of abrasives listed in Table 3. The two types of abrasive were fixed abrasive and loose abrasive, suspended in solution. 12PDF Image | surface roughness of the Nafion membrane in a PEM fuel cell
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